HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide a heat exchanger having a plurality of flow path forming bodies being piled configured so that a connection passage section is sealed by a packing for cost reduction instead of brazing, which makes manufacturing costs to high, for connecting the connection passages of the flow path forming bodies. SOLUTION: A second heat exchanger 5 is provided with a piling body 16 connected by the connection passages 14, 15 in which a plurality of flow path forming bodies 13 having a flat flow path 12 are piled therein. The flow path forming body 13 comprises a first plate 25 and a second plate 26 connected by brazing. In the first plate 25, a first connection section 35 comprising a collar section 37 and a peripheral wall section 36 is formed. In the second plate 26, a second connection section 38 having a peripheral wall section 39 of which diameter is smaller than that of the peripheral wall 36 by a predetermined amount is formed. The adjacent second connection section 38 of the peripheral wall 39 is fitted into the fist connection section 35. A packing 46 is attached to a packing attaching clearance 40 between the peripheral wall 36 and the peripheral wall 39 so that the clearance between the first connection section 35 and the second connection section 38 is sealed. COPYRIGHT: (C)2005,JPO&NCIPI